When a spark discharge takes place at the contact points of pellets (metal, alloy or graphite) dipped in the liquid medium (pure water or oil), the powder produced from the pellets reacts with the medium at the spark points.
This paper describes stoichiometrically the reaction between the powder and the liquid medium at the spark points by means of mass balance being based on the quantity of the cracked medium, the quantity of gas and powder produced, composition of gas, and the property of powder.
The results are summarized as follows:
1) WC-Co powder produced at the spark points reacted with water and 36.2% of carbon in WC-Co powder was changed into CO2 and CO gases by dicarburization while metallic components were partially oxidized.
2) The Aluminum powder reacted with OH-radical and formed Al(OH)3. The reaction took place in short supply of OH-radical by 20.1 % for its theoretical weight at the spark points.
3) The Tungsten Carbide was decarburized by its autolysis at the spark points in the oil medium. 11.4% of carbon was decarburized.